Finding the Fourth Proportional to 31,105.90, 42,926.79 and 17,494.21

Step by Step Solution

1. Step 1: Write the proportion equation
   31,105.90 : 42,926.79 = 17,494.21 : x
2. Step 2: Convert to fraction form
   31,105.90/42,926.79 = 17,494.21/x
3. Step 3: Cross multiply
   31,105.90x = 42,926.79 × 17,494.21
4. Step 4: Simplify right side
   31,105.90x = 750,969,976.78
5. Step 5: Solve for x
   x = 750,969,976.78/31,105.90
6. Step 6: Final answer
   x = 24,142.36